CN104550839A - Aluminizing hot tinning aluminum iron bi-metal low-pressure casting process - Google Patents
Aluminizing hot tinning aluminum iron bi-metal low-pressure casting process Download PDFInfo
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- CN104550839A CN104550839A CN201310507930.1A CN201310507930A CN104550839A CN 104550839 A CN104550839 A CN 104550839A CN 201310507930 A CN201310507930 A CN 201310507930A CN 104550839 A CN104550839 A CN 104550839A
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- Prior art keywords
- iron
- aluminizing
- aluminising
- aluminum
- hot tinning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/08—Tin or alloys based thereon
Abstract
The invention discloses an aluminizing hot tinning aluminum iron bi-metal low-pressure casting process. A casting iron sleeve is processed, and annealing heat treatment, iron sleeve aluminizing and surface treatment before hot tinning iron sleeve aluminizing are carried out; scale removal coarse processing is carried out; a soft shaft grinding wheel is used for grinding a special-shaped engaging surface of the iron sleeve; the iron sleeve is tightly clamped by tongs and is placed into aluminizing liquid for aluminizing, the aluminizing liquid is pure aluminum (or other aluminum alloy), the temperature is 745 DEG C, and the time is 4 minutes; deoiling and derusting are carried out. A 10-percent sodium hydroxide solution is adopted for deoiling, and the boiling lasts 15 minutes; the goal is to eliminate internal stress and to ensure the dimension stability of the iron sleeve. The aluminizing hot tinning aluminum iron bi-metal low-pressure casting process has the advantages that a tin plating layer is used for preventing an aluminum film layer from oxidizing, the time limitation is avoided, and the bonding intensity of the aluminum iron layer is high. Therefore the process is applicable to elements with simple shapes and is also applicable to elements with complicated shapes and processes. Although the process belongs to small-quantity production practice, the process is undoubtedly applicable to mass production.
Description
Technical field
The invention belongs to alloy cast iron casting technology field, be specifically related to a kind of aluminising hot tinning ferro-aluminum bimetallic low-pressure casting process.
Background technology
The so-called compound casting of aluminising hot tinning ferro-aluminum bimetallic low pressure casting is exactly the casting of metals of two kinds of different materials is merged become overall, as copper one iron bearing shell, and aluminium one iron cylinder, bimetallic cutter etc.Ferro-aluminum compound casting generally adopts alitizing.The roughly process of alitizing and principle as follows: the clean ironcasting of Surface Machining is immersed in aluminium liquid, when temperature is more than 600 DEG C, ferro-aluminum atom diffuses to form the alloy-layer of ferro-aluminum compound mutually, subsequently, by the ironcasting still with one deck liquid aluminium film outside alloy-layer, before aluminum membranous layer does not solidify, rapid mould assembling pours into aluminium liquid.Now aluminum membranous layer and aluminium liquid combine together, by means of the alloy-layer of ferro-aluminum compound, realize the strong bonded of ferro-aluminum.
The disadvantage of alitizing to strictly control exactly ironware leaching aluminium take out after to pouring into this period of time interval of aluminium liquid.More than 1 minute, liquid aluminium film solidify formed fusing point up to 2050 DEG C, the alundum (Al2O3) of dense structure, make ferro-aluminum cannot strong bonded together.In this strict time interval, not easily realize under actual production conditions, particularly the foundry goods of shape and complex process.Therefore, when cast rotating piston engine cylinder body, we have employed aluminising---hot tinning low pressure casting method, and its process and principle are briefly as follows: by surface after chemically treated ironcasting leaching aluminium, take out immediately and carry out hot tinning, to prevent from generating pellumina.And then the ironware of plated tin is put into casting mold (preheating or coldly to put, or namely put into after wicking, but do not limit by the time interval), low pressure pours into aluminium water, i.e. aluminium liquid (0.2 ~ 1.0 atmospheric pressure) under low pressure in crucible, in the middle part of crucible, gate spool is full of casting mold from bottom to top, and crystallization under stress.The tin layers that the heat of aluminium liquid makes aluminising iron overlap surface melts immediately, and aluminium liquid and aluminum membranous layer combine together, make ferro-aluminum strong bonded.The alclad part of the bimetal piece obtained like this, organizes finer and close, and few slag inclusion, pore, thin-walled large piece is also easily shaped.
Summary of the invention
In order to overcome the problems referred to above that prior art field exists, the object of the invention is to, a kind of aluminising hot tinning ferro-aluminum bimetallic low-pressure casting process is provided.
Foundry technology process is as follows:
(1) iron cover is poured into a mould.With dry type, bottom pour mold.
(2) iron cover processing.Outer surface goes most scab, oxide skin, and endoporus is first processed, to ensure location.
(3) annealing heat treatment.Object eliminates internal stress, ensures iron cover dimensional stability.The hot science and engineering skill of iron cover annealing: 530 ~ 550 DEG C are incubated 4 ~ 5 hours, cooling velocity <100 DEG C/time.
(4) iron cover aluminising front surface process.Scale removal roughing.Special-shaped composition surface is overlapped with flexible grinder polishing iron.Deoil and derust.Deoil employing 10% soda lye, boils 10-20 minutes, derust.Technical hydrochloric acid+1/3 cold water, boils 2 ~ 3 minutes.Iron cover is preheating to about 1000 DEG C.
(5) iron cover aluminising and hot tinning.Iron is applied mechanically pliers clamping and put into the aluminising of aluminising liquid, aluminising liquid is fine aluminium (or other aluminium alloys), temperature 730-750 DEG C, 4 minutes time.During aluminising process, aluminising liquid first will degas and remove slag, and when taking out iron cover after aluminising, first takes aluminium liquid surface scale off, takes out and wants rapidly, in order to avoid dry slag.Deoil before noting the aluminising of iron cover the Disposal quality that derusts, and do not have yellow rust.Hot tinning: immediately iron is overlapped taking-up after aluminising and put into tin liquor, tin plating electrolyte is pure tin, and temperature is 3000 ~ 3500 DEG C, and the time is 30 seconds ~ 1 point.After taking-up, dry, keep clean, use for low-pressure casting.
(6) low-pressure casting.Join sand one and make core (type)-dry a pack assembling.Pre-200-250 DEG C, hot iron cover, namely puts into casting mold, button case, low-pressure casting.Foundry goods slow cooling in case after cast, is sure not too early shake out, in order to avoid ferro-aluminum engages intermediate layer occur crackle.Carry out Ageing Treatment to improve cladding aluminum portions hardness, and the internal stress produced after eliminating roughing.Cylinder Technology for Heating Processing: 180 ± 10 DEG C are incubated 6 ~ 8 hours, cool with stove.
Aluminising hot tinning ferro-aluminum bimetallic low-pressure casting process provided by the invention, its beneficial effect is: 1, aluminising---hot tinning method is one more practicable ferro-aluminum compound casting method, and it prevents aluminum membranous layer to be oxidized with tin coating, not by time restriction, ferro-aluminum layer bond strength is high.Therefore not only the part of simple shape is suitable for, and shape, complex process part also applicable.Though we are only through the practice of limited production, undoubtedly be applicable to producing by batch.
2, low pressure bimetallic (aluminising hot tinning) method, except having above-mentioned advantage, more can ensure that thin-wall part is shaped, and can improve bimetal piece quality.
Detailed description of the invention
Below in conjunction with embodiment, to aluminising hot tinning ferro-aluminum bimetallic low-pressure casting process provided by the invention, be described in detail.
Embodiment one
(1) iron cover is poured into a mould.With dry type, bottom pour mold.
(2) iron cover processing.Outer surface goes most scab, oxide skin, and endoporus is first processed, to ensure location.
(3) annealing heat treatment.Object eliminates internal stress, ensures iron cover dimensional stability.The hot science and engineering skill of iron cover annealing: 535 DEG C.C is incubated 5 hours, cooling velocity <100 DEG C/time.
(4) iron cover aluminising front surface process.Scale removal roughing.Special-shaped composition surface is overlapped with flexible grinder polishing iron.Deoil and derust.Deoil employing 10% soda lye, boils 15 minutes, derust 1.Technical hydrochloric acid+1/3 cold water, boils 3 minutes.Iron cover is preheating to 1000 DEG C.
(5) iron cover aluminising and hot tinning.Iron is applied mechanically pliers clamping and put into the aluminising of aluminising liquid, aluminising liquid is fine aluminium (or other aluminium alloys), temperature 745 DEG C, 4 minutes time.During aluminising process, aluminising liquid first will degas and remove slag, and when taking out iron cover after aluminising, first takes aluminium liquid surface scale off, takes out and wants rapidly, in order to avoid dry slag.Deoil before noting the aluminising of iron cover the Disposal quality that derusts, and do not have yellow rust.Hot tinning: immediately iron is overlapped taking-up after aluminising and put into tin liquor, tin plating electrolyte is pure tin, and temperature is 3500 DEG C, and the time is 1 point.After taking-up, dry, keep clean, use for low-pressure casting.
Claims (1)
1. an aluminising hot tinning ferro-aluminum bimetallic low-pressure casting process, is characterized in that: cast iron cover iron cover is given processing, annealing heat treatment, iron cover aluminising and the process of hot tinning iron cover aluminising front surface; Scale removal roughing; Special-shaped composition surface is overlapped with flexible grinder polishing iron; Iron is applied mechanically pliers clamping and put into the aluminising of aluminising liquid, aluminising liquid is fine aluminium (or other aluminium alloys), temperature 745 degrees Celsius, 4 minutes time; Deoil and derust; Deoil employing 10% soda lye, boils and eliminate internal stress in 15 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310507930.1A CN104550839A (en) | 2013-10-25 | 2013-10-25 | Aluminizing hot tinning aluminum iron bi-metal low-pressure casting process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310507930.1A CN104550839A (en) | 2013-10-25 | 2013-10-25 | Aluminizing hot tinning aluminum iron bi-metal low-pressure casting process |
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| CN104550839A true CN104550839A (en) | 2015-04-29 |
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| CN201310507930.1A Pending CN104550839A (en) | 2013-10-25 | 2013-10-25 | Aluminizing hot tinning aluminum iron bi-metal low-pressure casting process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107824766A (en) * | 2017-10-25 | 2018-03-23 | 安徽恒利增材制造科技有限公司 | A kind of ferro-aluminum bimetal composite casting method |
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2013
- 2013-10-25 CN CN201310507930.1A patent/CN104550839A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107824766A (en) * | 2017-10-25 | 2018-03-23 | 安徽恒利增材制造科技有限公司 | A kind of ferro-aluminum bimetal composite casting method |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |